FM 18-5 Tactical Employment Tank Destroyer Unit 1944-07-18
"This manual is a guide to the tactical employment of tank destroyer units both self-propelled and towed. The methods of employment described herein do not comprise a set of inflexible rules. Commanders must adapt the principles of employment described to the terrain, climate, tactical situation, and equipment available."
Digitized by AHEC (U.S. Army Heritage Collections) http://www.carlisle.army.mil/ahec/
"This manual supersedes FM 18-5, 16 June 1942 and Training circular no. 88, War Department, 1943."